Codechange: make md5sumToString std::string compatible

src/string.cpp

@@ -612,20 +612,12 @@ int CDECL seprintf(char *str, const char *last, const char *format, ...)
 
 /**
  * Convert the md5sum to a hexadecimal string representation
- * @param buf buffer to put the md5sum into
- * @param last last character of buffer (usually lastof(buf))
  * @param md5sum the md5sum itself
- * @return a pointer to the next character after the md5sum
+ * @return the string representation of the md5sum.
  */
-char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16])
+std::string MD5SumToString(const uint8 md5sum[16])
 {
-	char *p = buf;
-
-	for (uint i = 0; i < 16; i++) {
-		p += seprintf(p, last, "%02X", md5sum[i]);
-	}
-
-	return p;
+	return FormatArrayAsHex({md5sum, 16});
 }