diff --git a/.woodpecker/build.yaml b/.woodpecker/build.yaml
new file mode 100644
index 0000000..88340c4
--- /dev/null
+++ b/.woodpecker/build.yaml
@@ -0,0 +1,25 @@
+matrix:
+  platform:
+    - linux/amd64
+
+labels:
+  platform: ${platform}
+    
+steps:
+  build:
+    when:
+      event: [push]
+    image: alpine:latest
+    commands:
+      - apk update
+      - apk add --no-cache bash build-base
+      - make
+
+  test:
+    when:
+      event: [push]
+    image: alpine:latest
+    commands:
+      - apk update
+      - apk add --no-cache bash
+      - echo hier | ./bubblebabble | grep xipak-nynil-dedox 
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d868119
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,49 @@
+#
+#    This file is part of bubblebabble.
+#
+#    Copyright (C) 2018-2025 T.v.Dein.
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+#    You can contact me by mail: <tom AT vondein DOT org>.
+
+.PHONY: all clean man install
+
+# warning: do not set -O to 2, see TODO
+CFLAGS = -Wall -Wextra -Werror -O1 -g
+LDFLAGS=
+OBJS   = main.o bubblebabble.o
+DST    = bubblebabble
+PREFIX = /usr/local
+UID    = root
+GID    = 0
+
+all: $(DST)
+
+$(DST): $(OBJS)
+	$(CC) $(OBJS) -o $(DST)
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $*.c -o $*.o
+
+clean:
+	rm -rf *.o $(DST) build .cache
+
+man:
+	pod2man udpxd.pod > udpxd.1
+
+install: $(DST)
+	install -d -o $(UID) -g $(GID) $(PREFIX)/bin
+	install -o $(UID) -g $(GID) -m 555 $(DST) $(PREFIX)/bin/
+
diff --git a/README.md b/README.md
index 5c7ab8f..1795089 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # bubblebabble
+
 Encode to Bubble Babble
 
 ## Intro
@@ -10,8 +11,8 @@ function so you can encode anything to bubble babble.
 
 ## Compile and Install
 
-    gcc -g bubblebabble.c -o bubblebabble
-    sudo install -o root -g wheel bubblebabble /usr/local/bin/
+    make
+    sudo make install
 
 ## Usage
 
@@ -20,7 +21,7 @@ function so you can encode anything to bubble babble.
 
 ## Copyright + Author
 
-- Copyright (c) 2017 T.v.Dein. All rights reserved.
+- Copyright (c) 2017-2025 T.v.Dein. All rights reserved.
 
 fingerprint_bubblebabble(): 
 
diff --git a/bubblebabble.c b/bubblebabble.c
index ac1965e..f8430ee 100644
--- a/bubblebabble.c
+++ b/bubblebabble.c
@@ -30,89 +30,48 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <sys/types.h>
+#include "bubblebabble.h"
 
-static char *
-fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len)
-{
-        char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
-        char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
-            'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
-        u_int i, j = 0, rounds, seed = 1;
-        char *retval;
+char *fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len) {
+  char vowels[] = {'a', 'e', 'i', 'o', 'u', 'y'};
+  char consonants[] = {'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
+                       'n', 'p', 'r', 's', 't', 'v', 'z', 'x'};
+  u_int i, j = 0, rounds, seed = 1;
+  char *retval;
 
-        rounds = (dgst_raw_len / 2) + 1;
-        if ((retval = calloc(rounds, 6)) == NULL)
-                return NULL;
-        retval[j++] = 'x';
-        for (i = 0; i < rounds; i++) {
-                u_int idx0, idx1, idx2, idx3, idx4;
-                if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
-                        idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
-                            seed) % 6;
-                        idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
-                        idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
-                            (seed / 6)) % 6;
-                        retval[j++] = vowels[idx0];
-                        retval[j++] = consonants[idx1];
-                        retval[j++] = vowels[idx2];
-                        if ((i + 1) < rounds) {
-                                idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
-                                idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
-                                retval[j++] = consonants[idx3];
-                                retval[j++] = '-';
-                                retval[j++] = consonants[idx4];
-                                seed = ((seed * 5) +
-                                    ((((u_int)(dgst_raw[2 * i])) * 7) +
-                                    ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
-                        }
-                } else {
-                        idx0 = seed % 6;
-                        idx1 = 16;
-                        idx2 = seed / 6;
-                        retval[j++] = vowels[idx0];
-                        retval[j++] = consonants[idx1];
-                        retval[j++] = vowels[idx2];
-                }
-        }
-        retval[j++] = 'x';
-        retval[j++] = '\0';
-        return retval;
-}
-
-
-int main(int argc, char **argv) {
-  FILE *input;
-  u_char digest[1024];
-  size_t digestlen;
-  char *hash;
-  int out = 1;
-  
-  if(argc < 2) {
-    input = stdin;
-  }
-  else {
-    if((input = fopen(argv[1], "rb")) == NULL) {
-      fprintf(stderr, "oops, could not open file!\n");
-      goto done;
+  rounds = (dgst_raw_len / 2) + 1;
+  if ((retval = calloc(rounds, 6)) == NULL)
+    return NULL;
+  retval[j++] = 'x';
+  for (i = 0; i < rounds; i++) {
+    u_int idx0, idx1, idx2, idx3, idx4;
+    if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
+      idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) + seed) % 6;
+      idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
+      idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) + (seed / 6)) % 6;
+      retval[j++] = vowels[idx0];
+      retval[j++] = consonants[idx1];
+      retval[j++] = vowels[idx2];
+      if ((i + 1) < rounds) {
+        idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
+        idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
+        retval[j++] = consonants[idx3];
+        retval[j++] = '-';
+        retval[j++] = consonants[idx4];
+        seed = ((seed * 5) + ((((u_int)(dgst_raw[2 * i])) * 7) +
+                              ((u_int)(dgst_raw[(2 * i) + 1])))) %
+               36;
+      }
+    } else {
+      idx0 = seed % 6;
+      idx1 = 16;
+      idx2 = seed / 6;
+      retval[j++] = vowels[idx0];
+      retval[j++] = consonants[idx1];
+      retval[j++] = vowels[idx2];
     }
   }
-
-  digestlen = fread(digest, 1, 1024, input);
-
-  if(digestlen > 0) {
-    hash = fingerprint_bubblebabble(digest, digestlen);
-    fprintf(stdout, "%s\n", hash);
-    free(hash);
-    out = 0;
-  }
-  else {
-    fprintf(stderr, "oops, could not calculate bubbles!\n");
-    goto done;
-  }
-
- done:
-  return out;  
+  retval[j++] = 'x';
+  retval[j++] = '\0';
+  return retval;
 }
diff --git a/bubblebabble.h b/bubblebabble.h
new file mode 100644
index 0000000..6cd7aaf
--- /dev/null
+++ b/bubblebabble.h
@@ -0,0 +1,31 @@
+/*
+    This file is part of bubblebabble.
+
+    Copyright (C) 2018-2025 T.v.Dein.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    You can contact me by mail: <tom AT vondein DOT org>.
+*/
+
+#ifndef HAVE_BUBABL
+#define HAVE_BUBABL 1
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+char *fingerprint_bubblebabble(u_char *dgst_raw, size_t dgst_raw_len);
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..d436bf7
--- /dev/null
+++ b/main.c
@@ -0,0 +1,54 @@
+/*
+    This file is part of bubblebabble.
+
+    Copyright (C) 2018-2025 T.v.Dein.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    You can contact me by mail: <tom AT vondein DOT org>.
+*/
+
+#include "bubblebabble.h"
+
+int main(int argc, char **argv) {
+  FILE *input;
+  u_char digest[1024];
+  size_t digestlen;
+  char *hash;
+  int out = 1;
+
+  if (argc < 2) {
+    input = stdin;
+  } else {
+    if ((input = fopen(argv[1], "rb")) == NULL) {
+      fprintf(stderr, "oops, could not open file!\n");
+      goto done;
+    }
+  }
+
+  digestlen = fread(digest, 1, 1024, input);
+
+  if (digestlen > 0) {
+    hash = fingerprint_bubblebabble(digest, digestlen);
+    fprintf(stdout, "%s\n", hash);
+    free(hash);
+    out = 0;
+  } else {
+    fprintf(stderr, "oops, could not calculate bubbles!\n");
+    goto done;
+  }
+
+done:
+  return out;
+}