Fixes makefile error: *** missing separator. Stop.

makefile_fixer.sh

#!/bin/bash

# File to fix.
MAKEFILE="Makefile"

# Check if the Makefile exists.
if [[ ! -f "$MAKEFILE" ]]; then
    echo "Error: $MAKEFILE not found in the current directory."
    exit 1
fi

# Create a temporary file.
TEMP_FILE="Makefile.tmp"

# Process the Makefile, replacing space-indented lines with tabs.
awk '{ 
    # Replace lines that start with spaces and a command-like structure
    if ($0 ~ /^[[:space:]]+[^[:space:]]/) 
        sub(/^[[:space:]]+/, "\t"); 
    print 
}' "$MAKEFILE" > "$TEMP_FILE"

# Replace the original Makefile with the fixed one.
mv "$TEMP_FILE" "$MAKEFILE"

echo "Fixed $MAKEFILE: All lines with incorrect indentation have been replaced with tab-indented lines."