1 files changed, 12 insertions, 7 deletions

diff --git a/ch2/2-10.c b/ch2/2-10.c
index 619e2d1..3c6b0cc 100644
--- a/ch2/2-10.c
+++ b/ch2/2-10.c
@@ -2,21 +2,26 @@
 
 #define MAX_LEN 20
 
-void lower(char* source, char* dest);
+void lower_str(char source[], char dest[]);
+char lower_char(char c);
 
 int main() {
-    char* s = "This Is A Test.";
-    char lower_s[MAX_LEN];
-    lower(s, lower_s);
-    printf("%s -> %s\n", s, lower_s);
+    char s[] = "This Is A Test.";
+    char lowered[MAX_LEN];
+    lower_str(s, lowered);
+    printf("%s -> %s\n", s, lowered);
     return 0;
 }
 
-void lower(char* source, char* dest) {
+void lower_str(char source[], char dest[]) {
     int i;
 
     for (i = 0; source[i] != '\0'; i++)
-        dest[i] = source[i] >= 'A' && source[i] <= 'Z' ? source[i] - 'A' + 'a' : source[i];
+        dest[i] = lower_char(source[i]);
 
     dest[i] = '\0';
 }
+
+char lower_char(char c) {
+    return c >= 'A' && c <= 'Z' ? c - 'A' + 'a' : c;
+}