Why am i getting this "no declaration matches" error?

EDIT: I have realised that this strange error is due to me not fully understanding the text editing software i used and it not fully saving my files when i thought it did in some strange ways. my code is now working as i intended it to

I have recently tried to create a small program to write text to a VGA buffer. To do this i have a certain class called terminal. I then tried to add a function and then got a strange error:

extlib/terminal.cpp:3:6: error: no declaration matches 'void terminal::ret1()'

This is strange as ret1 is clearly declared in the terminal.h file below. Why is this happening?

NOTE: the function ret1 is not the original function i just changed it to that to try and debug the problem, I am using gcc-9.3.0 on Cygwin and the command I used to compile it was:

i686-elf-g++ -c extlib/terminal.cpp -ffreestanding -O2 -Wall -Wextra -fno-exceptions -fno-rtti

terminal.h

#include "stdlib/string.h"enum vga_colour{  VGA_COLOUR_BLACK = 0,  VGA_COLOUR_BLUE = 1,  VGA_COLOUR_GREEN = 2,  VGA_COLOUR_CYAN = 3,  VGA_COLOUR_RED = 4,  VGA_COLOUR_MAGENTA = 5,  VGA_COLOUR_BROWN = 6,  VGA_COLOUR_LIGHT_GREY = 7,  VGA_COLOUR_DARK_GREY = 8,  VGA_COLOUR_LIGHT_BLUE = 9,  VGA_COLOUR_LIGHT_GREEN = 10,  VGA_COLOUR_LIGHT_CYAN = 11,  VGA_COLOUR_LIGHT_RED = 12,  VGA_COLOUR_LIGHT_MAGENTA = 13,  VGA_COLOUR_LIGHT_BROWN = 14,  VGA_COLOUR_WHITE = 15,};class terminal{public:  terminal(vga_colour fg, vga_colour bg);  void putText(const char* str);private:  void ret1();  size_t terminal_row;  size_t terminal_column;  const size_t VGA_WIDTH = 80;  const size_t VGA_HEIGHT = 25;  uint8_t terminal_colour;  uint16_t* terminal_buffer = (uint16_t*) 0xB8000;  inline uint16_t vga_entry(unsigned char uc, uint8_t colour);};

terminal.cpp:

#include "terminal.h"void terminal::ret1(){  return;}terminal::terminal(vga_colour fg, vga_colour bg){  terminal::terminal_colour = fg | bg << 4;  terminal::terminal_row = 0;  terminal::terminal_column = 0;  for(size_t y = 0; y < terminal::VGA_HEIGHT; y++){    for(size_t x = 0; x<terminal::VGA_WIDTH; x++){      size_t index = y * terminal::VGA_WIDTH + x;      terminal::terminal_buffer[index] = vga_entry('', terminal::terminal_colour);    }  }}inline uint16_t terminal::vga_entry(unsigned char uc, uint8_t colour){  uint16_t luc = uc;  uint16_t lcol = colour;  return luc | lcol << 8;}void terminal::putText(const char* str){  size_t len = strlen(str);  for(size_t i = 0; i < len; i++){    if(str[i] == '\n'){      terminal::terminal_row++;      terminal::terminal_column = 0;    }else{      terminal::terminal_buffer[terminal::terminal_row * terminal::VGA_WIDTH + terminal::terminal_column] = vga_entry(str[i], terminal::terminal_colour);    }  }}