Undergrad String theory vs Quantum field theory

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Quantum Field Theory (QFT) posits that particles are excitations of underlying quantum fields, establishing fields as fundamental. String theory challenges this by proposing that strings are the true fundamental building blocks, with particles emerging from vibrating strings. The relationship between the two theories raises questions about whether they contradict each other or coexist. String theory maintains that QFT remains valid as an effective approximation, suggesting that quantum fields still play a role within the framework of string theory. Ultimately, both theories contribute to the understanding of the universe's fundamental structure.
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what does it mean for QFT if string theory turns out to be correct?
So QFT treats particles as excitations of their underlying quantum field, meaning that fields are more fundamental than particles. Then String theory comes in and says that actually strings are the fundamental building block of the universe and that the different particles are vibrating strings. Do the 2 theories really contradict each other or am I misunderstanding something, like what happens to the quantum field of QFT in string theory, are they completely gone or do they have a place in the theory?
 
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According to string theory, QFT is still valid as an effective approximate theory.
 
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