I am a 16 year old male and i hv noticed that i hv some hair growth along the line that connects the belly button to the pubic area which is not very visible. does it mean i have stopped growing and my puberty is done?i grew 3-4 cm from the past year

Hard to guess: If there was growth last year, there might be continued growth this year. Most people reach their maximum height in their late teens. Without nutritional problems or chronic childhood illnesses, height is largely based on genetics and parental heights. Aside from eating right, exercising, sleeping well, and being happy, there's not much a person nor his doctor can do to increase height.