Reverse the letters in every word

c/reverse.c

@@ -0,0 +1,36 @@
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+  for(argc -= 1, argv += 1; *argv; argc -= 1, argv += 1) {
+    char *idx = *argv;
+    char *begin = NULL;
+    char *end = NULL;
+
+    for(; *idx; idx += 1) {
+      if(isalpha(*idx)) {
+        if(!begin) {
+          begin = idx;
+        }
+
+        end = idx;
+      } else {
+        for(; end && end >= begin; end -= 1) {
+          fputc(*end, stdout);
+        }
+
+        if(begin) {
+          begin = NULL;
+          end = NULL;
+        }
+
+        fputc(*idx, stdout);
+      }
+    }
+
+    fputc('\n', stdout);
+  }
+
+  return 0;
+}