In C, we can copy a string to another string using the `strcpy()` function. Here's an example:

```
#include <stdio.h>
#include <string.h>

int main() {
    char str1[100] = "Hello, world!";
    char str2[100];

    strcpy(str2, str1);

    printf("Original string: %s\n", str1);
    printf("Copied string: %s\n", str2);

    return 0;
}
```

In this program, we first declare two character arrays `str1` and `str2`. We initialize `str1` with the string "Hello, world!". We then use the `strcpy()` function to copy `str1` to `str2`. Finally, we print both the original string and the copied string using `printf()`.

Note that the `strcpy()` function copies the contents of the source string to the destination string, including the null character (`\0`) at the end. Also, make sure that the destination string has enough space to accommodate the source string, including the null character.

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