Fortran 77 Comment Parsing Issue with Initial 'C' Character

**Describe the bug**
Hello i-CodeCNES team,

I've encountered an issue with the Fortran 77 analysis in i-CodeCNES where lines starting with the `C` character are not recognized as comments. This happens even when explicitly specifying the language using the command:

```batch
icode.bat --checked-languages "Fortran 77"
```

**Expected behavior**
In Fortran 77, any line starting with a `C` or `c` in the first column should be treated as a comment. ([reference](https://docs.oracle.com/cd/E19957-01/805-4939/z40007332024/index.html))

**Current Behavior:**
Lines starting with `C` are not considered comments by the analyzer, leading to potential misinterpretation of the code structure.

**Temporary Workaround:**
A temporary workaround is to replace all starting `C` characters with `!` to ensure they are recognized as comments by i-CodeCNES.

**Suggested Fix:**
It would be beneficial to update i-CodeCNES to correctly recognize lines starting with `C` as comments when analyzing Fortran 77 code.