文件应用作业，萌新求教
已知2个磁盘文件如ml.txt、m2.txt，这两个文件中存放着已排好序的若干字符，要求将两个文件有序合并，合并后存放在文件m3.txt中。能写一段代码实现上述功能吗，谢谢 运用freopen，快速简洁读写文件
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void merge(const char * m1, const char * m2) {
int m1len = strlen(m1 + 1);
int m2len = strlen(m2 + 1);
int m1p = 1, m2p = 1, tot = 0;
char r = {};
while (m1p <= m1len && m2p <= m2len) {
if (m1 < m2) {
r[++tot] = m1;
} else {
r[++tot] = m2;
}
}
while (m1p <= m1len) r[++tot] = m1;
while (m2p <= m2len) r[++tot] = m2;
printf("%s", r + 1);
}
int main() {
freopen("m1.txt", "r", stdin);
char m1 = {}, m2 = {};
fgets(m1 + 1, 10000, stdin);
m1 = '\0';
freopen("m2.txt", "r", stdin);
fgets(m2 + 1, 10000, stdin);
m2 = '\0';
freopen("m3.txt", "w", stdout);
merge(m1, m2);
}
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