developing a java or c compiler from scratch

I need you to fix my own proyect.
Developing a compiler involves a series of steps, including lexical analysis, parsing, semantic analysis, optimization, and code generation. The compiler is usually divided into a front-end and a back-end.
Steps
Lexical analysis: Also known as scanning, this is the first stage of compiler design. It involves recognizing the tokens that the grammar defines, such as keywords, operators, and constants.
Parsing: Also known as syntax analysis, this is the second stage of compiler design.
Semantic analysis: This is the third stage of compiler design.
Optimization: This involves optimizing the code.
Code generation: This involves translating the intermediate representation produced by the front-end into machine code.