fs Add tree subcommand

ulib/string/string.c

@@ -172,3 +172,14 @@ char *string_tokenizealloc(char *s, char *delim) {
 
   return w;
 }
+
+// https://stackoverflow.com/questions/2488563/strcat-implementation
+char *string_combine(char *dest, const char *src) {
+  size_t i, j;
+  for(i = 0; dest[i] != '\0'; i++);
+  for(j = 0; src[j] != '\0'; j++) {
+    dest[i+j] = src[j];
+  }
+  dest[i+j] = '\0';
+  return dest;
+}

ulib/string/string.h

@@ -17,6 +17,7 @@ char *string_strcpy(char *dest, const char *src);
 char *string_strchr(const char *s, int c);
 int string_strncmp(const char * s1, const char * s2, size_t n);
 char *string_tokenizealloc(char *s, char *delim);
+char *string_combine(char *dest, const char *src);
 
 #endif